The easiest way is if it doesn't need to be simplified. Multiply -2.105 by \(\frac{1000}{1000}\). You get the fraction \(-\frac{2105}{1000}\). While this is technically the answer, you can simplify this down to \(\frac{421}{200}\). Because 421 is a prime number, this can not be simplified any further. Therefore, the solution is \(\frac{421}{200}\).
\(\frac{421}{200}\).
